1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kobusy [5.1K]
2 years ago
9

Can anyone help me with this

Mathematics
2 answers:
Sedbober [7]2 years ago
8 0

Answer:

x=0, - 9

Step-by-step explanation:

x^2+9x=0

x(x+9)=0

x=0 or x=-9

Serga [27]2 years ago
6 0

Answer:

x =0  x= -9

Step-by-step explanation:

x^2 + 9x = 0

Factor out x

x(x+9) =0

Using the zero product property

x =0 x+9 =0

x =0  x= -9

You might be interested in
What is square root of 100? Is it irrational or rational?
Step2247 [10]
The suquare root is 10. it is a rational number
5 0
3 years ago
Read 2 more answers
I need help with questions #7 and #8 plz
katen-ka-za [31]

Answer:

7. A = 40.8 deg; B = 60.6 deg; C = 78.6 deg

8. A = 20.7 deg; B = 127.2 deg; C = 32.1 deg

Step-by-step explanation:

Law of Cosines

c^2 = a^2 + b^2 - 2ab \cos C

You know the lengths of the sides, so you know a, b, and c. You can use the law of cosines to find C, the measure of angle C.

Then you can use the law of cosines again for each of the other angles. An easier way to solve for angles A and B is, after solving for C with the law of cosines, solve for either A or B with the law of sines and solve for the last angle by the fact that the sum of the measures of the angles of a triangle is 180 deg.

7.

We use the law of cosines to find C.

18^2 = 12^2 + 16^2 - 2(12)(16) \cos C

324 = 144 + 256 - 384 \cos C

-384 \cos C = -76

\cos C = 0.2

C = \cos^{-1} 0.2

C = 78.6^\circ

Now we use the law of sines to find angle A.

Law of Sines

\dfrac{a}{\sin A} = \dfrac{b}{\sin B} = \dfrac{c}{\sin C}

We know c and C. We can solve for a.

\dfrac{a}{\sin A} = \dfrac{c}{\sin C}

\dfrac{12}{\sin A} = \dfrac{18}{\sin 78.6^\circ}

Cross multiply.

18 \sin A = 12 \sin 78.6^\circ

\sin A = \dfrac{12 \sin 78.6^\circ}{18}

\sin A = 0.6535

A = \sin^{-1} 0.6535

A = 40.8^\circ

To find B, we use

m<A + m<B + m<C = 180

40.8 + m<B + 78.6 = 180

m<B = 60.6 deg

8.

I'll use the law of cosines 3 times here to solve for all the angles.

Law of Cosines

a^2 = b^2 + c^2 - 2bc \cos A

b^2 = a^2 + c^2 - 2ac \cos B

c^2 = a^2 + b^2 - 2ab \cos C

Find angle A:

a^2 = b^2 + c^2 - 2bc \cos A

8^2 = 18^2 + 12^2 - 2(18)(12) \cos A

64 = 468 - 432 \cos A

\cos A = 0.9352

A = 20.7^\circ

Find angle B:

b^2 = a^2 + c^2 - 2ac \cos B

18^2 = 8^2 + 12^2 - 2(8)(12) \cos B

324 = 208 - 192 \cos A

\cos B = -0.6042

B = 127.2^\circ

Find angle C:

c^2 = a^2 + b^2 - 2ab \cos C

12^2 = 8^2 + 18^2 - 2(8)(18) \cos B

144 = 388 - 288 \cos A

\cos C = 0.8472

C = 32.1^\circ

8 0
3 years ago
Help pls! this is due tonight. thanks!
erma4kov [3.2K]

Answer:

Neon: 0

Oxide:  -2

Copper:   2

Tin:  0

Step-by-step explanation:     To solve you must add/subtract the numbers to get the charge, for example if its -30 charge from electrons and 10 charge from protons, -30 + 10 = -20     therefore the charge is -20

6 0
2 years ago
Read 2 more answers
Two parallel lines are cut by a transversal, as shown below. Solve for b. Then explain your reasoning.
Svetlanka [38]

Answer:

b = 14

Step-by-step explanation:

Since both angles are diagonal each other, they are equal to each other.

5b = b + 56

-b      -b           (subtract b from both sides)

<u>4b</u> = <u>56</u>

4       4            (divide both sides by 4 to solve for b)

 b = 14

3 0
2 years ago
The measure of AngleMKJ is 80°. After analyzing the diagram, Janelle concludes that Ray K L is an angle bisector. Point K has th
dem82 [27]

Answer: it’s c

Step-by-step explanation:

9 0
3 years ago
Read 2 more answers
Other questions:
  • Ioana a citit dintr-o carte cu povesti 1314 pagini,depasind cu 238 pagini jumatatea cartii.cate pagini are cartea cu povesti a I
    12·1 answer
  • Habib and Ali are friends and basketball coaches too. Habib goes to school every 4 days and Ali goes every 6 days to coach the s
    8·2 answers
  • Given the sets a={0,1,2,3,} b={a,b,c,d} c={0,a,2,b}. Find B u c
    6·1 answer
  • May u help me with problem because i dont understand it
    12·1 answer
  • What is 25% of $1200?<br> A) 900<br> B) 250 <br> C) 600 <br> D) 300
    8·2 answers
  • Idk how to do this and I need it in an hour
    15·1 answer
  • IM MARKING BRAINLIEST
    9·1 answer
  • Use compatible numbers to estimate the quotient. <br> 522 divided by 6 please help!!!
    12·1 answer
  • I put the question in a doc cuz its a screenshot, please help
    13·1 answer
  • A string of length 160cm is cut into 2 pieces, in the ratio 3:5. Find the length of each piece​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!